Question

Aperture of the human eye is $2mm$. Assuming the mean wavelength of light to be $5000\mathring{A}$ the angular resolution limit of the eye is:

• A. $2min$
• B. $1min$
• C. $0.5min$
• D. $1.5min$

Answer 1

The correct option is B $1min$

Answer is B.

The angular resolution limit of eye = $=\frac{1.22\lambda }{a}$

$\frac{1.22\times 5\times {10}^{-7}}{2\times {10}^{-3}}$

$\frac{1.22\times 5\times {10}^{-7}}{2\times {10}^{-3}}\times \frac{180}{\pi }\times 60$ minutes

= 1 minute.

Hence, the angular resolution limit of the eye is $1minute$.